【摘要】 利用表面包覆1层吡啶分子的量子点和化学还原性石墨烯通过π-π堆积的方式,制备了石墨烯-量子点(PbSe、ZnSe、CdSe)复合物。包覆在量子点外层的吡啶分子芳香环结构起到桥梁的作用,将石墨烯和量子点π-π堆积起来,同时延伸了石墨烯的共轭结构。通过XRD、UV-Vis、TEM、Raman等表征手段,考察了相应复合物的结构、形成机理与性质。所制石墨烯-量子点复合物能稳定分散于水或极性溶液中,使得此类石墨烯复合物在生物体内具有良好的应用前景。通过循环伏安法对制备的产物进行了电化学性能测试。根据循环伏安曲线,复合物CCG-ZnSe的电容较单纯的CCG、ZnSe有大幅提高。更多还原

【Abstract】 Graphene-metal selenium quantum dots(QDs) composites have been prepared by π-π stacking of pyridine-capped metal selenium QDs and chemically converted graphene(CCG) in aqueous solution.The aromatic structures of pyridine capped on metal selenium QDs introduce a π-π stacking interaction between CCG and QDs,and extend the conjugated structure of CCG.The structural details and formation mechanism of the resultant graphene-metal selenium QDs composites were characterized by X-ray diffraction,UV-Vis absorption,transmission electron microscope and Raman scattering studies.The CCG-metal selenium composites disperse stably in aqueous solution,allows them to be potentially used in biological tissues and further application.The cyclic voltammetry experimental result shows that the electrochemical performances of CCG-ZnSe were greatly improved than that of pure CCG,ZnSe powder.更多还原